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Debt Securities (Schedule Of Cost And Estimated Fair Value Of Securities Available For Sale And Securities Held To Maturity By Contractual Maturity) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Securities held to maturity, amortized cost	$ 812	$ 913
Debt Securities held to maturity, estimated fair value	751	950
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	165
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	164
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	2,276
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	2,134
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	841
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	753
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	147
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	128
Debt Securities, Available-for-sale, Amortized Cost	31,367	28,263
Debt securities available for sale	27,933	28,481
Residential Agency [Member]
Debt Securities held to maturity, amortized cost	289	370
Debt Securities held to maturity, estimated fair value	258	377
Debt Securities, Available-for-sale, Amortized Cost	19,477	18,873
Debt securities available for sale	16,954	18,962
Residential Non-Agency [Member]
Debt Securities, Available-for-sale, Amortized Cost	1	1
Debt securities available for sale	1	1
Commercial Agency [Member]
Debt Securities held to maturity, amortized cost	523	543
Debt Securities held to maturity, estimated fair value	493	573
Debt Securities, Available-for-sale, Amortized Cost	8,262	6,271
Debt securities available for sale	7,613	6,373
Commercial Non Agency [Member]
Debt Securities, Available-for-sale, Amortized Cost	198	532
Debt securities available for sale	$ 186	$ 536

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